I work for an international manufacturer. We're deploying Surface Hubs to all locations that have a good enough internet connection. I've only used it a couple times as a glorified whiteboard and had a good experience.

Apparently it has some very good microphones and software running. Regardless of where a person is in the room, it will adjust the microphone level so you can hear them clearly. The people training mentioned their location has had a couple instances where a little side conversation was broadcast to the other side. They made sure to mention that in every training session.